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San Joaquin County Community Environmental Setting,Impacts,and Mitigation Measures Development Department Surface Hydrology,Slormwater,and Water Quality The General Industrial Permit generally requires facility operators to: ■ eliminate unauthorized nonstormwater discharges; ■ develop,retain on site,and implement a SWPPP to identify sources of pollution and to prescribe implementation of best management practices (BMPs)to reduce or prevent pollutants in industrial stormwater discharges and authorized nonstormwater discharges; and ■ perform monitoring of stormwater discharges and authorized nonstormwater discharges. Areas of industrial activity where surface runoff must be controlled and treated include all storage areas and storage tanks, shipping and receiving areas,fueling areas,vehicle and equipment storage/maintenance areas, material handling and processing areas,waste treatment and disposal areas,dust-or particulate- generating areas, cleaning and rinsing areas,and all other areas of industrial activity that are potential pollutant sources(State Water Resources Control Board 1997). Any changes to the industrial site or activity require an update of the SWPPP and implementation of new control measures. Construction activities disturbing 1 acre or more of land are subject to the ` permitting requirements of the NPDES General Permit for Discharges of Stormwater Runoff Associated with Construction Activity (General Construction Permit). For qualifying projects,the project applicant must submit,before construction begins, a notice of intent(NOI)to the Central Valley RWQCB to be covered by the General Construction Permit. The General Construction Permit requires the preparation and implementation of a stormwater pollution prevention plan (SWPPP),which also must be completed before construction begins. Implementation of the plan starts with the commencement of grading and continues through the completion of the project. Upon completion of the project, the applicant must submit a notice of termination to the Central Valley RWQCB .. to indicate that construction is complete. Both the General Construction Permit and the General Industrial Permit are L expected to apply to the proposed project. Best Management Practices. The term best management practices(BMPs) refers to a variety of measures used reduce pollutants in stormwater and other non-point-source runoff. Measures range from source control, such as use of permeable pavement,to treatment of polluted runoff,such as detention or retention basins and constructed wetlands. Maintenance practices (e.g. street sweeping)and public outreach campaigns also fall under the category of BMPs. The effectiveness of a particular BMP is highly contingent upon the context in which it is applied and the method in which it is implemented. Expected effectiveness of BMPs is summarized in Table 3.G-1. As illustrated below, BMPs are best used in combination to remove target pollutants most effectively. DeSilva Gales Quarry Project Draft Environmental Impact Report 3.G-5 AS 05105.05